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Cable TV security means

  • US 4,313,132 A
  • Filed: 10/31/1979
  • Issued: 01/26/1982
  • Est. Priority Date: 10/31/1979
  • Status: Expired due to Term
First Claim
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1. In combination with a cable TV converter having a power supply, a passive enabling circuit adapted to be connected to the TV cable at a location remote from the converter and remote from the subscriber'"'"'s premises, a sensing circuit connected to the TV cable at the converter cable input and to the converter power supply to provide power to said enabling circuit through the TV cable from the power supply, means in said sensing circuit controlling operation of said power supply in accordance with the presence or absence of the enabling circuit, and said enabling circuit, when connected to said sensing circuit and power supply, providing an input voltage at said sensing circuit to maintain operation of said power supply.

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